Well that is a difficult question to answer. I would guess perhaps one thin shim (approx. 1/ 8+or-) would be absorbed in the tightening process. I have found that one critical point is the B post on the door. For example, if you start with minimum of 3 thin shims on all 4 out riggers and now look at the back rear mount at the rear bumper you will need to have a gap of 1/8 plus or minus to move the B post front or back depending on the door gap you need. Moreover, make sure the doors operator freely. The doors, once all the closing hardware is on, do not have much room before they rub.
Steve